Hoisting mechanism.



H. l. SCHMICK.

HOISTING MECHANISM.

APPLICATION min AUG.14. |915.

[1v1/aj.

Eme/Wto( H.1.SCHM1CK.

HOISTING MECHANISM.

APPLICATIDN FILED AUG.|4. |916.

Patented Nw. 6, 191?.

4 SHEETS-SHEET 2 H. 1. SCHMICK.

HolsTlNG MEcHANlsM.

' APPLICATION FILED AUG-14|19I6 Patented Nov. 6, 1917.

4 SHEETS-SHEET 3.

H. 1. SCHMICK.

HOISTING MECHANISM.

APPLICATION FILED Aue.14, m16.

1,245,623. Patented Nov. 6,191?.

4 SHEETS-SHEET 4.

HENRY J'. SCHMICK, LOCK HAVEN, PENNSYLVANIA. v

HorsTING ivrncirnmsivr.y

Specification of Letters Patent. i Patented NV 6, 19111` Applicationfiled August 14, 1916. Serial No. 114,807.

To all whom it may concern.'

Beit known that I, HENRY J. ScHrricK, a vcitizen of the United States,residing at Lock Haven, in the county of Clinton and,y State ofPennsylvania, have invented certain new and useful Improvements inHoisting Mechanisms; and I do hereby declare thek following to be afull, clear,.and eXact de-- scription of the invention, such as will en?able others,y skilled in the art to which it appertains to make and usethe same.

The invention relates to improvements in hoisting mechanisms.

The primary object of the invention is to provide a comparativelyinexpensive and simplified device of the type mentioned, and one inwhichhigher eiiiciency is to be obtained thanis possiblewith the now knowntypes of such devices. l f

Another object of the invention is to provide a device of thischaracter, and one of.

a. construction extremelylight in weight for a given load to be liftedas -compared with the various typesof such devices now in use. v

A further object of the invention is to provide la hoisting mechanism,wherein extreme economy intime inthe hoisting operation obtains ,with aminimum amount of power applied for the accomplishing of such purose.

A 4still Vfurther object of the invention is to provide a hoistingmechanism embodying all `of the foregoing advantages, and one in. whichthe load is readily sustained at any' point within the range of thelifting movement without resorting to the use of addif tional orextraneousm'echanisms, such as pawls or the like, as has heretofore beennecessary in the known types of such devices.

With the foregoing, -and other objects in View, the invention resides inthe certain new and useful construction and arrangement of parts as willbe hereinafter more fully described, set forth in the appended claim,and illustrated in the accompanying drawings, in which,

Figure 1 is a side elevation of the preferred embodiment of the same,

Fig. 2 is a vertical transverse section, e

Fig. 3 is a vertical transverse section on the line 3 3 of Fig. 1, Fig.t isV a plan view of the cam gear, and, Fig. 5 is an end view with thecam and the coverplate removed. e Y

Fig. 6 is a plan view of the guide member f orthe operating chain. i Y

Referring to the drawings, in which sirni lar characters of reference`designate corre-l sponding parts in the several views thereof, thenumeral 10 indicates the major portion of a housing having a removableside wall 11, and an angular offset portion 12, the latter beingprovided with a removable cover plate 13, therem'ovable parts 11 and 13being suitably secured in position on the integralportions 10 and 12,respectively, by means of screws 14. rlhe housing 10 is formedl with anupwardly projecting portion in which is suitably secured a sup` portinghook 16, by means of which the device is suspendedin any desiredoperativey position. 1 n e The integral side wall 17 and the remov?"able side wall 11 are each formed to provide concentrically disposedbearings 18` and 19 respectively, in which are supported the oppositelydisposed reduced portions 20 and 21, of a hub 22, tlie`latterbeingintegrally formed with a gear element 23, and having its circularface, extending from one side of the gear element 23, formed with aplurality of communicating recesses 24. These 11ecesses 2li are eachshaped to receive alternate links of a lifting chain Q6, which isadapted to be trained over the huby 22, while the slots 25, connectingthe recesses 24, are shaped to receive the alternate links connectingythe iirst mentioned links of the chain. The lower portion of the majorportion of the housing 10 is open, as at 27 to admit of the dependingtherefrom of the opposite legs of the chain 26, after the latterv hasbeen positioned on the hub 22, and is further provided with anintegrally formed partition wall Q8 which snugly surrounds anintermediate portion of the hub 22 to pro-\ vide an inclosed chamber forthe gear 23, when the side wall 11 is properly securedin position.,`

To prevent accidental displacement of the lifting chain 26 in its travelover the hub Q2, there is provided a guide member 29, positionedyWithinl the casing l0 and secured thereto at the point of greateststrain tending to lift a link from its corresponding recess, and thesame is formed with a curved Wall 30 having flanges 3l disposed atopposite sides and extending to either side of the path of travel of thechain. A second guide member is supported transversely of the opening27, by means of a screw 33, and projects upward in parallel relation tothe opposite legs of the lifting chain, and has a reduced portion 34,which projects partially Within the path of the slots 25, connecting therecesses 24 formed in the hub The guide 32 is retained in its verticalposition by means of oppositely disposed pairs of lugs formed on theopposed Walls of the housing l0 and the partition 28.

The cover plate 13, of the offset portion 12, of the housing, is formedWith a concentrieally disposed bearing sleeve 36, in which is supporteda spindle 374 integrally formed With a cam `plate 3S, which, whenproperly mounted for operation, occupies the entire interior of theoffset portion l2, and is disposed in a verticalplane and at rightangles to the gear body 23,

The inner face of the cam plate 3S is formed with a single radio-helicalcam element or member 39, Which is adapted to continuously andprogressively mesh with the radial curved teeth 40, formed on theperiphery of the gear body 23. To effect the continuous and progressivemeshing of the Working surfaces of the cam-element 39 With the radialcurved teeth 40, aforesaid, the said Working surfaces of the former aredisposed on a curve of approximate cycloidal formation, and are madeangular in crosssection in one direction of the element forwardly fromthe inner starting point, or root of the curve, to a point approximatelyintermediate its length, and in a reverse angular or inclined relationfor the remainder of its length to its outer end. This angul'arity ofthe cam-element 39, inclining first in one direction and then in adirection opposite thereto, causes the member 39 to support the entireWeight or load, through the medium of the radial teeth 40, of the gearQ3, at any given point in the travel of the lifting chain 26, anddispenses with any and all of the usual clutch or stop mechanismsheretofore provided for such purpose. The cam-member 39, as shown, isformed of a length to provide overlapping ends, so that two of theradial teeth 40, of the gear 23, are in constant engagement, and thespace between the overlapped ends is of just sufficient greater Widththan that of a single tooth to allow clearance of the same to and fromengagement therewith, and in the revolution of the cam, the severalteeth 3G are engaged consecutivelyl To properly distinguish theapproximate cycloidal curve formation of the cam-elcment 39, the samehas been designated radio-helical, since the motion defined by itstravel is radially or trans-axially, and at right angles to the axis ofthe cam plate 38, and its direction of operation in the present instanceis clockwise or right-handed.

The end of the spindle 37, of the camplate 38, is of a length to projectoutwardly of the bearing sleeve 3G, and to support thereon a drive Wheelor pulley 4l, the latter being secured in position by means of a set nut42, or in any other suitable or desired manner, and is preferably formedwith a conveXed body portion 43, which admits of the rim 44 rotating inthel plane of the bearing sleevey 36. The rim 44 is formed with a seriesof recesses 45 having thev shape and of a size to receive alternatelinks 47 of an operating chain, and slots 46 connecting the recesses 45andv of a shape and size to receive the alternateI linksv 48, of thechain 47.

'Supported from the housing 10, by means of bracket arms 49, is a loopedguide 50 which overlies and surrounds the upper portion of the pulley orWheel 4l, in a manner to prevent the displacement of the cha-in duringthe strain thereon for the rotation of the drive Wheel. .To retain theguide 50 in a horizontal plane, the' housing 10 is formed' with steppedshoulders 5,1 and 52, the latter underlyinor the inner bar 53, of thelooped portion ofP the guide for the pur'- pose. Y Y

The inner end of the chain 26", is attached to a screw 55, which islengaged in spaced lugs formed With the housing l0 and the' removableside Wall ll. By so fastening the chain it prevents the operator runningthe chain olf the hub 22. Y

rlhe invention contemplates the filling of the chamber 56', inclosed bythe partition Wall 28, the removable side Wall 1l, of the housing, andthe cap plate 13, of the offset portion 12, with oil, whereby the movingparts of the device operate with a minimum amount of friction.

Having thus described the desired embodiment of the invention, it is tobe thoroughly understood that various changes in the detailedconstruction and arrangement of the parts may be resorted to Withoutdeparting from the spirit and scope of the same.

Having thus fully described thel invention, what is claimed, is:` j

In a hoisting mechanism, thev combination with a housing, a disk mountedin the housing and having a single Cani projecting ing similar and theopposite corners of the from one face thereof, means for rotatingopposite faces of the teeth being disposed 10 said disk, a gear Wheelmounted in the housin alinement and parallel With a line drawn ing atright angles to said disk, one face through the axis of the gear Wheel,and a of said gear Wheel being substantially in a chain Wheel rotatablewith the gear Wheel. plane with the axis of the disk, the teeth of' Intestimony whereof I aiiix my signathe gear Wheel being radial andengaging ture.

the cam, the opposite faces of said teeth be- HENRY J. SCHMICK.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, v Washington, D. 6.

